The New Super Mario 2D side-scroller is due out on October 20
Here is an overview of the game, via Nintendo:
The next evolution of 2D side-scrolling Super Mario Bros. games is headed to Nintendo Switch! When you touch a Wonder Flower in the game, the wonders of the world unlock—pipes could come alive, hordes of enemies may appear, characters might change their looks, for example—transforming the gameplay in unpredictable ways. Excitement and different surprises await in each course.
Super Mario Bros. Wonder features Princess Peach, Princess Daisy and Yoshi as playable characters, in addition to familiar characters like Mario, Luigi and Toad. Plus, Super Mario Bros. sees the debut of Mario’s newest power-up, which allows him to transform into Elephant Mario! What other suprises could this game contain.